I make many of my textures, or modify stock ones. The galvanized steel is modified from the brushed aluminum stock texture. I replaced the image map with Eric Winemiller's noise procedural element. I really love Eric's shader elements. (Check out Digital Carver's Guild -- digitalcarversguild.com -- they're free! and he has some cool stuff for purchase) The flag might be wrong, but it's how I remember it from the mailbox when I was a kid living in the middle of nowhere....